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| 1 /* | |
| 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 */ | |
| 10 | |
| 11 #include "webrtc/base/posix.h" | |
| 12 | |
| 13 #include <sys/wait.h> | |
| 14 #include <errno.h> | |
| 15 #include <unistd.h> | |
| 16 | |
| 17 #if defined(WEBRTC_LINUX) && !defined(WEBRTC_ANDROID) | |
| 18 #include "webrtc/base/linuxfdwalk.h" | |
| 19 #endif | |
| 20 #include "webrtc/base/logging.h" | |
| 21 | |
| 22 namespace rtc { | |
| 23 | |
| 24 #if defined(WEBRTC_LINUX) && !defined(WEBRTC_ANDROID) | |
| 25 static void closefds(void *close_errors, int fd) { | |
| 26 if (fd <= 2) { | |
| 27 // We leave stdin/out/err open to the browser's terminal, if any. | |
| 28 return; | |
| 29 } | |
| 30 if (close(fd) < 0) { | |
| 31 *static_cast<bool *>(close_errors) = true; | |
| 32 } | |
| 33 } | |
| 34 #endif | |
| 35 | |
| 36 enum { | |
| 37 EXIT_FLAG_CHDIR_ERRORS = 1 << 0, | |
| 38 #if defined(WEBRTC_LINUX) && !defined(WEBRTC_ANDROID) | |
| 39 EXIT_FLAG_FDWALK_ERRORS = 1 << 1, | |
| 40 EXIT_FLAG_CLOSE_ERRORS = 1 << 2, | |
| 41 #endif | |
| 42 EXIT_FLAG_SECOND_FORK_FAILED = 1 << 3, | |
| 43 }; | |
| 44 | |
| 45 bool RunAsDaemon(const char *file, const char *const argv[]) { | |
| 46 // Fork intermediate child to daemonize. | |
| 47 pid_t pid = fork(); | |
| 48 if (pid < 0) { | |
| 49 LOG_ERR(LS_ERROR) << "fork()"; | |
| 50 return false; | |
| 51 } else if (!pid) { | |
| 52 // Child. | |
| 53 | |
| 54 // We try to close all fds and change directory to /, but if that fails we | |
| 55 // keep going because it's not critical. | |
| 56 int exit_code = 0; | |
| 57 if (chdir("/") < 0) { | |
| 58 exit_code |= EXIT_FLAG_CHDIR_ERRORS; | |
| 59 } | |
| 60 #if defined(WEBRTC_LINUX) && !defined(WEBRTC_ANDROID) | |
| 61 bool close_errors = false; | |
| 62 if (fdwalk(&closefds, &close_errors) < 0) { | |
| 63 exit_code |= EXIT_FLAG_FDWALK_ERRORS; | |
| 64 } | |
| 65 if (close_errors) { | |
| 66 exit_code |= EXIT_FLAG_CLOSE_ERRORS; | |
| 67 } | |
| 68 #endif | |
| 69 | |
| 70 // Fork again to become a daemon. | |
| 71 pid = fork(); | |
| 72 // It is important that everything here use _exit() and not exit(), because | |
| 73 // exit() would call the destructors of all global variables in the whole | |
| 74 // process, which is both unnecessary and unsafe. | |
| 75 if (pid < 0) { | |
| 76 exit_code |= EXIT_FLAG_SECOND_FORK_FAILED; | |
| 77 _exit(exit_code); // if second fork failed | |
| 78 } else if (!pid) { | |
| 79 // Child. | |
| 80 // Successfully daemonized. Run command. | |
| 81 // WEBRTC_POSIX requires the args to be typed as non-const for historical | |
| 82 // reasons, but it mandates that the actual implementation be const, so | |
| 83 // the cast is safe. | |
| 84 execvp(file, const_cast<char *const *>(argv)); | |
| 85 _exit(255); // if execvp failed | |
| 86 } | |
| 87 | |
| 88 // Parent. | |
| 89 // Successfully spawned process, but report any problems to the parent where | |
| 90 // we can log them. | |
| 91 _exit(exit_code); | |
| 92 } | |
| 93 | |
| 94 // Parent. Reap intermediate child. | |
| 95 int status; | |
| 96 pid_t child = waitpid(pid, &status, 0); | |
| 97 if (child < 0) { | |
| 98 LOG_ERR(LS_ERROR) << "Error in waitpid()"; | |
| 99 return false; | |
| 100 } | |
| 101 if (child != pid) { | |
| 102 // Should never happen (see man page). | |
| 103 LOG(LS_ERROR) << "waitpid() chose wrong child???"; | |
| 104 return false; | |
| 105 } | |
| 106 if (!WIFEXITED(status)) { | |
| 107 LOG(LS_ERROR) << "Intermediate child killed uncleanly"; // Probably crashed | |
| 108 return false; | |
| 109 } | |
| 110 | |
| 111 int exit_code = WEXITSTATUS(status); | |
| 112 if (exit_code & EXIT_FLAG_CHDIR_ERRORS) { | |
| 113 LOG(LS_WARNING) << "Child reported probles calling chdir()"; | |
| 114 } | |
| 115 #if defined(WEBRTC_LINUX) && !defined(WEBRTC_ANDROID) | |
| 116 if (exit_code & EXIT_FLAG_FDWALK_ERRORS) { | |
| 117 LOG(LS_WARNING) << "Child reported problems calling fdwalk()"; | |
| 118 } | |
| 119 if (exit_code & EXIT_FLAG_CLOSE_ERRORS) { | |
| 120 LOG(LS_WARNING) << "Child reported problems calling close()"; | |
| 121 } | |
| 122 #endif | |
| 123 if (exit_code & EXIT_FLAG_SECOND_FORK_FAILED) { | |
| 124 LOG(LS_ERROR) << "Failed to daemonize"; | |
| 125 // This means the command was not launched, so failure. | |
| 126 return false; | |
| 127 } | |
| 128 return true; | |
| 129 } | |
| 130 | |
| 131 } // namespace rtc | |
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Chromium Code Reviews
Issue 2367403002:
Delete posix.h (RunAsDaemon). (Closed)
